The "Klassic Skins Pack" contains classic costumes for Scorpion, Sub-Zero, Reptile, Ermac, Kitana, Mileena, and Jade, as well as Scorpion's "Toasty" Fatality, Sub-Zero's "Spine Rip" Fatality, and Reptile's "Head Snack" Fatality.
You can check out a trailer previewing the content here or below.
For those of you who pre-ordered or picked up an early release copy of the retail game at select retailers, you'll likely already have at least one of these skins and possibly a Fatality (I have Sub-Zero's classic skin and Fatality), and if you bought the game's Kollector's Edition you'll also have Ermac's classic skin.
This content pack allows you to have all this pre-order content in one shot, and comes to you at the rip-off price of 400 Microsoft Points or $4.99 (US) on the PlayStation Network.
Why a rip-off price? Well, you all know how I feel about DLC and the nickle and dimming that publishers push on consumers today, and I consider this content pack as an example of the worst kind.
Everything in the Mortal Kombat: Klassic Skins Pack is already on your retail disc; you're simply buying the ability to unlock it. And of course since it's classic Mortal Kombat, it's really only two costumes that have simply had colours changed.
This kind of DLC is a really low move, and I strongly advise you to pass and save your Microsoft Points/money for something that's at least had some real effort put into it.